Pavement breaking machine



Oct. 14, 1952 w. v. CORNETT 2,613,923

PAVEMENT BREAKING MACHINE Filed on. 24, 1946 4 Sheets-Sheet 1 INVENTOR.WALTER V. CORNETT BY v ATTORNEYS 1952 w. v. CORNETT PAVEMENT BREAKINGMACHINE 4 Sheets-Sheet 2 Filed Oct. 24, 1946 INVENTOR. WALTER V. CORNETTA 7' TORNE VS Oct. 14, 1952 W. V. CORNETT PAVEMENT BREAKING MACHINEFiled Oct. 24, 1946 5 z S H 5 I 74 E] a; V

4 Sheets-Sheet 5 INVENTOR. WALTER v. CORNETT fl im A TTORNEJQ? Oct. 14,1952 W. V. CORNETT PAVEMENT BREAKING MACHINE Filed Oct. 24, 1946 4Sheets-Sheet 4 [NVEN TOR. WALTER l/ COR/VETT A T TORNE VS Patented Oct.14, 1952 UNITED STATES PATENT OFFICE PAVEMENT BREAKING MACHINE Walter v.Cornett, Los Angeles, Calif.

Application October 24, 1946, Serial No. 705,446

Claims.. (01. 262-13) This invention relates to a machine for breakingconcrete pavements and the like and has for its object improvements inthe machine described in United States Patents 1,830,751 dated November10, 1922, and 1,891,222 dated 'Deceme ber 20, 1932. Y

Another object is the provision of improved means for moving theturntable or movable frame carrying the hammer or impact tool used inmachines of the class described.

Another object is the provision of an improved impact tool or hammer foruse in machines of the class described.

Further objects will be apparent from the followingdescription anddrawings wherein are shown by way of illustration, preferred embodimentsof the invention. It will be understood, however, that many changes inthe details of construction may be made, the invention being as definedby the appended claims.

In the accompanying drawings:

Figure 1 is a plan view of .the improved turntable constructionembodying the invention with some of theiloor plates removed.

Figure -2 is a sectional view of the turntable on the line 2, 2 ofFigure ,1;

Figure 3'is. a sectional view of the hammer or impact tool on the line3, 3 of Figure 2; and

- Figure 4 is a side elevational view of the impact tool shown'inFigures 1 to 3 inclusive.

In the aforesaid U. S.Patent 1,891,222 is shown and described a pavementbreaking machine comprising a suitable vehicle upon which all ofthe'mechanism is mounted so as to be readily transportable. Any desiredtype of vehicle may be used, but a self-propelled vehicle, such as anordinary automobile truck is preferable. The term self -propelled isherein used to denote a vehicle having a complete power plant, such asthe usual gasoline engine, as distinguishedv from a vehicle having anoutside electric motor requiring power from an outside source.

As the details of the construction of the vehicle are of no importancein connection with the present invention, it will be sufiicient to pointout that the numeral Ill denotes a suitable framework mounted on thevehicle and. secured to cross members II so as to be rigidly mountedthereon.

. This framework carries a circular track I2 upon which is mounted aturntable or elongated movable platform, I3 adapted to revolve around acenter'jpivot or bearing I4 secured to the framework, jThe-details ofthe construction of thegmountii p fsuch a turntable are morefullydescribed in the aforesaid patents, and may be of any suitableconstruction that permits the turntable to be revolvably. mounted uponthe chassis or framework of the truck.

In the instant invention the turntable I3 may consist of thelongitudinally disposed members I5, I6, secured together by suitablecross members I1 and provided with an outer skirt-like casing I8 whichsurrounds the'entire turntable so as to partially enclose the workingparts. The casing I8 is secured to the framework of the turntable bymeans of cap screws or bolts as indicated at 19.

The turntable I3 is provided with floor plates 20 which cover the uppersurface of the table, the upper surfaces of members I5, I6 projectingtherethrough.

The turntable is provided with a suitable number of rollers 2| securedto the turntable inany suitable manner and adapted to revolvably supportthe turntable on the track I2 so that it may revolve around the centerbearing I4.

Mounted on the turntable I3 is a source of energy such as the aircompressor 22, which may be driven by any suitable means such as'thegasoline engine 23. Extending from the air compressor is a delivery pipe24 forthe purpose of delivering air from the .compressor to the operating mechanism for moving the turntable and for operating the impacttool as presently described. As the details of construction of thecompressor and the motor therefor are immaterial to the presentinvention, they are not described here in detail and it will also benoted that the motor and compressor may be mounted upon the framework I0of the truck and may be positioned anywhere thereon, although thepreferred construction is that herein described, wherein the source ofcompressed air such as the compressor 22 and its driving motor 23 movewith the turntable.

Mounted upon the web or cross member 25 extending between thelongitudinal members I5, [6 of the turntable, is a suitable compressedair motor- 26 having reduction gears 21 connected.

f eludes the drum 35 secured to a shaft 35 which in effect, formsanextension of the output shaft 28; The shaft 36 is supported in abearing 3'].

mounted on one of the cross members I! as shown in Figure 2. The innerend of shaft 36 is supported in bearing 38 on another one of said crossmembers H.

Revolvably supported on the members l5, [6 of the turntable or on anyconvenient part thereof, are the sheave pulleys 39, 40, adapted toreceive a cable 41 as indicated in Figure 1.

The outer ends of cable 4| are attached at 42 to the stationary circularcable drum portion 43,, Fig. .2, located on the framework 1.0 andforming a sheave-immediately below track l2. The oable 4| is wound aboutthe drum 3.5 as generally indicated at M, so that when the drum 35 isrevolved by the operation of the air motor '28 the entire turntable willbe revolved about the center bearing 14 in a manner that will beobvious, the direction of revolution being dependent on the direction ofthe revolution of the motor 26 driving drum 35..

On the opposite end of the turntable from the apparatus for moving sameas just described, is located a standard or pedestal 45 supporting the'control mechanism for the turntable and the valve, the handle ofwhichis indicated at 47.. By

moving this handle in one direction, say to the right, the pipe 45 isconnected through the valve to a'pipe 18 connected to the motor .26,causing same to revolve clockwise which may revolve the turntableclockwise looking down on Figure 1.

When the handle 4"! is moved to the left, the air supply pipe 46 isconnected through the valve to the pipe 49 to cause the motor 26 torevolve counterclockwise, and thereby revolve the turntableanti-clockwise. This enables the left hand end of the turntable carryingthe impact tool (to be presently described) to be moved about the centerbearing I' l to assume various positions relative to the rear end of thetruck on which it is mounted, as more fully shown and. described in thetwo patents aforementioned.

Anoperators seat, generally indicated by the numeral 59 may bespring-mounted in any desired manner on the turntable so that anoperator seated thereon may be within .easy reaoh'of the handles i! and82 of the control valves.

Any suitable type of impact tool or hammer can be mounted on theimproved turntable structime just described. Such, for example, as theimpact tools described in the patents heretofore mentioned. However, apreferred form of hammer is herein illustrated together-with means for.controlling same.

Referring now .to Figure 3, the longitudinal members [5 and Hi of theturntable project upwardly through theplates 20, and secured to thesemembers in any suitable manner is the journal block 5| provided withbearing bushings 52 in which is supported a trunnion block 53.

The trunnion block has a pair of oppositely disposed cars 54, and on oneside thereof has an outwardly extending portion or lug to which may besecured one end of the leaf spring 56, the outer end of said springbeing secured in a slotted plate 51 on the turntable as shown, so thatthe outer end of the spring overlies a compression spring 58 and thetension of said last spring can be arranged' by adjusting bolt 59 toadjust the outer end of spring 56 to raise and lower same and therebyadjust the hammer assembly either way from a vertical position. Thisspring 56 yieldably supports the hammer assembly for limited movementabout the axis of the journal block 5 I.

The trunnion block 53 has secured thereto the cylinder 60 .having theusual cylinder head 6! and containing a piston 62 of any suitableconstruction having secured thereto the piston rod 63 which extendsdownwardly through the bearing bushing 64 in the block 53.

Below the bearing 64 is located a suitable member 85 secured in theblock 53 in order to provide a seat for the bearing.

Pushed inwardly from below the block '65 is a gland 66 which is splitvertically along the center line 5! and the parts of the gland are .heldtogether and in place by any suitable .means such as the apertured plate68, said plate extending laterally as best seen in Figure 4 and beingbored to receive the bolts 59 which pass through the plate and upwardlythrough the cars 54 of the block 53. These bolts are provided with thesprings w and nuts and washers 1| by means of which, in a manner thatwill be obvious, the plate 68 carrying gland 66 is spring-pressedupwardly around thepiston rod 63, and, as the gland '65 is split aspreviously described, it can be easily removed and replaced withoutdisassembling any parts of the device except the plate 68 and the bolts69 and their springs, nuts and washers. The gland acts as a packing orstufiing box to prevent leakage of air from the hammer cylinder. V V rIt willbe noted that the gland 66 can be easily reached for inspectionand replacement by a workman underneath theturntable and without havingto jack up the truck or raise the turntable thereupon. U

Securely attached to the outer end of the piston rod 63 is a head 12which has secured therein in any suitable manner the side rods orguides13 Y which pass through holes in the block 53 and are provided withsuitable bearing bushings 74 so that these'rods 1'3 reciprocate with thepiston and serve, along with the piston rod '63, to guide thehammer-head 12;

The lower end of the head 12, is boredou't to receive a collar 15, thebore 16 of. which is adapted to receive the shank of impact tools, such,for example, as those shown U. S. Patent 1,891,222 dated December 20,193 2. p

A transverse pin 11 may extend through the head '12, a portion of thewall of the collar 7 5, and

a portion of the shank of any tool placed in the bore H5 in order tosecure the tool to the head.

The cylinder head 6] may be securely bolted down to the upper portion 78of the trunnion block 53 by means of the rods 19 with the cylinder 60held securely therebetween.

- The upper and lower ports to admit air above and below the cylindermay be connected by means of pipes 80 and 8| to a control valve-thehandle of which is shown at 82. When this valve is moved .in onedirection, air is admitted through airv supply pipe 48 via the valve topipe 81 thereby lifting the piston rod 62 and the tool carried thereby.

If the handle 82 is pushed downward, air will be admitted from the airsupply pipe 48 via the valve to pipe 80 thereby depressing the pistonand causing the tool operated thereby to strike the surface below thetruck.

It will, of course, be understood that both valves referred to hereinmay have suitable relief ports so that when operating in one direction,the air lines to the opposite side of the valve are open to atmosphere.Such valve constructions are well-known and therefore no attempt is madeto describe them in detail.

It will be understood that pipes 80, 8| extending between the valvemechanism and the air cylinder may be the usual flexible hose used forsuch purposes and are therefore not shown in the drawings. Such hose isshown in the patents before mentioned.

An alternate arrangement for connecting the valve to the hammer is shownin Figure 4 in which all flexible connections between the valve andhammer are eliminated. Here the numerals 80a, 8Ia indicate the pipesconnected to couplings 83, 84, which are supported on the axiallyaligned threaded studs or bosses 85 on the trunnion block 53. Theconduits or pipes 80, 8| to the hammer cylinder are now connected intothe couplings as shown, therefore these pipes are rigid at all timeswhile the hammer is moved.

As the hammer swings, it will be obvious that the pipes 89a, 81a willturn in the threaded couplings 83, 84, and if sufiiciently long threadedconnections are provided, these joints may turn Without appreciableleakage of air, or any suitable form of slip joint 86, 81 can be used atthese points or at any point in this piping axially aligned with theaxis about which the hammer turns, to permit the piping 80a, 81aconnected to the hammer control valve to remain stationary while thehammer assembly moves about its horizontal axis.

What is claimed is:

1. In a device of the character described, a turntable having a journalblock thereon, a trunnion block mounted in saidjournal block and adaptedto move about a horizontal axis above said table, a fluid operatedimpact tool carried on said trunnion block and movable therewith, saidtool including a cylinder and piston therein, said cylinder having portslocated on opposite sides of the piston, conduits extending from saidports and having bores aligned with the axis of said trunnion block asecond set of conduits communicating with said bores and thereby beingaxially aligned with said axis of said trunnion block, and slipconnections between said sets of conduits whereby said first conduitsmay remain fixed in respect to said cylinder ports when said cylinder ismoved about said axis.

2. In a. device of the character described, a

carried on said trunnion block and movable therewith, said toolincluding a cylinder and piston, said cylinder having ports located onopposite sides of said piston, axially aligned bosses on said trunnionblock, pipe couplings connected to said bosses, pipes extending betweensaid couplings and said cylinder ports, and pipes axially aligned withsaid horizontal axis and extending 1 into said couplings whereby fluidconnection is maintained through said couplings while said tool movesabout said axis.

3. The device claimed in claim 2 in which said pipe couplings compriseor include slip connections arranged to permit relative rotary movementbetween said pipes connected to said cylinder ports and said last pipesthat are aligned with the axis of said trunnion block.

4. In-a device of the character described a turntable, a fluid-operatedimpact tool mounted upon said turntable to move about a horizontal axisabove said turntable, said tool including a cylinder and piston, saidcylinder having ports located on opposite sides of said piston, rigidconduits connected to said ports and extending towards the horizontalaxis of said tool, a pair of connectors positioned to turn about saidaxis on opposite sides of said tool and maintain fluid connection withsaid conduits the while, and pipes secured to said connectors, thelatter per-' mitting the movement of said tool and the conduits aboutsaid axis.

5. In a device of the character described, a support; a journal blockfixed to said support; an impact tool including a cylinder and a pistonrod connected to said piston; a trunnion block secured to said cylinderand having laterally ex-' tending bearing portions supported in saidjournal block whereby said, tool is movably mounted b in said bearingson said support with its horizontal axis passing through the axis ofsaid pis- REFERENCES CITED The following references are of record in thefile of this patent:

UNITED STATES PATENTS Number Name Date 155,550 Smith Sept. 29, 1874539,475 Githens May 21, 1895 861,369 Kidder July 30, 1907 1,168,687Titus Jan. 18, 1916 1,195,344 Feller et al Aug. 22, 1916 1,541,392Reaney June 9, 1925 1,830,751 Cornett Nov. 10, 1931 1,891,221 CornettDec. 20, 1932 2,263,925 Jefirey et al Nov. 25, 1941

